Regexp non-capturing groups

Consideriamo questa stringa.

https://stackoverflow.com/questions/tagged/regex

Se applichiamo questa regexp.

(https?|ftp)://([^/\r\n]+)(/[^\r\n]*)?

I risultati saranno.

Match "http://stackoverflow.com/"
     Group 1: "http"
     Group 2: "stackoverflow.com"
     Group 3: "/"

Match "https://stackoverflow.com/questions/tagged/regex"
     Group 1: "https"
     Group 2: "stackoverflow.com"
     Group 3: "/questions/tagged/regex"

A questo punto se non ci interessa il protocollo è meglio utilizzare il non-capturing groups ?:

(?:https?|ftp)://([^/\r\n]+)(/[^\r\n]*)?

Cosi il risultato finale sarà:

Match "http://stackoverflow.com/"
     Group 1: "stackoverflow.com"
     Group 2: "/"

Match "https://stackoverflow.com/questions/tagged/regex"
     Group 1: "stackoverflow.com"
     Group 2: "/questions/tagged/regex"